Buffer overflow in Tenda Ac19
CVE-2026-123966
A vulnerability was determined in Tenda AC19 16.03.10.07. Affected by this issue is the function saveParentControlInfo of the file /goform/saveParentControlInfo. This manipulation of the argument deviceId causes heap-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been publicly disclosed and may be utilized.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Tenda Ac19 — versions 16.03.10.07
Weakness classification (CWE)
References
- github.com/Tmzop/Tenda-AC19-saveParentControlInfo/blob/main/report.md (exploit)
- vuldb.com/cve/CVE-2026-123966 (third-party-advisory)
- vuldb.com/submit/1035173 (third-party-advisory)
- vuldb.com/vuln/432038 (technical-description, vdb-entry)
- vuldb.com/vuln/432038/cti (signature, permissions-required)
- www.tenda.com.cn/ (product)
Frequently asked questions
- What is CVE-2026-123966?
- CVE-2026-123966 is a critical-severity vulnerability in Tenda Ac19, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 10.0/10. Published 2026-11-07.
- How severe is CVE-2026-123966?
- Critical severity. CVSS v3 base score is 10.0 out of 10.